Self Contained Weighing Module

Transcription

1 Self Contained Weighing Module Model 9010 FEATURES Capacities 3-90kg Unique adjustable tare load cancelling mechanism Highly effective viscous damping 6 Built-in overload limit stops in three directions Weighing speed is much faster than standard load cell IP65 protection OPTIONAL FEATURES Stainless steel version IP66 with additional breather tube Digital version available DESCRIPTION Model 9010 is a self contained weighing module for use in repeated shock-loading applications or where fast weighing and settling times are required such as multihead weighers, check weighers and other static and dynamic weighing applications characterized by sudden or impact loading. Model 9010 s unique fluid damping system allows the load cell to be used in applications that previously required the use of LVDT s or similar types of measuring devices. The model 9010 has a unique adjustable tare load cancellation feature which brings load cell adaptability into checkweighing and grading applications. The two additional sense wires feed back the voltage reaching the load cell. Complete compensation of changes in lead resistance due to temperature change and/or cable extension, is achieved by feeding this voltage into the appropriate electronics. OUTLINE DIMENSIONS in millimeters Outline Dimensions All Capacities x Load Mounting Holes ¼-20UNC or M6 x 14mm Deep 4 Mounting Holes Ø Protected under U.S. Patent No: 5,232,062 Document Number: Revision: 27-Jul-07 1

2 Model 9010 Self Contained Weighing Module HIGH PERFORMANCE DYNAMIC WEIGHING Weigh Module 9010 consists of a single point load cell enclosed in an environmentally protected, electroless nickel plated aluminium housing. The Module integrates load cell performance, viscous damping, adjustable tare offset mechanism and overload protection. LOAD CELL s Model 1010, 1040 or 1140 single point load cells can be used in the Model Standard capacities 3kg to 90kg; for higher capacities, consult Vishay Tedea-Huntleigh. OVERLOAD PROTECTION Model 9010 is equipped with built-in overload stops for positive (push), negative (pull) and twisting loads. These stops are factory adjusted for each specific application. DAMPING Model 9010 features a unique viscous damping technique developed and patented by, which provides Faster settling time Higher weighing speeds Load cell protection (extended working life) Damping parameters are factory set for each specific application. The benefits of damping are illustrated by the test results shown below, which show actual oscilloscope traces for damped and undamped load cells under identical tests. TARE LOAD CANCELLING Model 9010 features an adjustable tare load cancelling mechanism which provides a tare offset of up to 35kg (in several ranges). The tare offset is factory set but may be adjusted by the user. This feature enables the use of a lower capacity load cell, resulting in electronic circuits with lower gains, lower noise, higher stability and lower temperature drifts. An example for the power of tare cancelling: Assume an application with 5kg dead load and 2kg (useful) load. 1. Without tare cancelling: Total load of 5+2 is 7kg, therefore, a load cell with capacity of at least 10kg has to be selected. 2. With tare cancelling: The 5kg dead load can be opposed and effectively cancelled by the Tare Cancellation Mechanism, leaving a load of 2kg only, hence a capacity of 3kg can be selected. 3. Results: A capacity of 3kg rather than of 10kg is enabled by the Tare Cancellation feature for a gain of over 3 times in resolution and noise. LOAD CELL LIFE Because of the design and unique features of Model 9010, the life of the load cell is increased substantially. For example, in one typical set of life tests, the undamped load cell failed after approximately 300,000 cycles. The damped load cell held without any significant deterioration for more than 300 million cycles. In this test a model kg load cell was used. A dead load of 2.5kg was mounted 150mm from the mounting centre. A 4.5kg impact was applied at that point at a rate of 8 times/sec. ENVIRONMENTAL PROTECTION The load cell in the model 9010 is completely enclosed in a rugged, electroless nickel plated aluminium or stainless steel housing to withstand splashing. It is environmentally protected to IP65, a special breather valve allows atmospheric pressure equalization while excluding splashing liquids. With an optional addition of a breather tube the protection is rendered IP66. A built-in shut-off valve is used for shipping. SETTLING TIME Settling time is the elapsed time from the instant of loading to the time the load cell s signal remains within the user specified accuracy. Settling time is affected by the following parameters. 1. Total mass on the module and it s distance from the mounting centre. 2. Impact loading characteristics. 3. Environmental temperature change. For optimum performance, the above parameters must be specified by the user for each order. Document Number: Revision 27-Jul-07

5 Legal Disclaimer Notice Vishay Disclaimer All product specifications and data are subject to change without notice. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, Vishay ), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay s terms and conditions of purchase, including but not limited to the warranty expressed therein, which apply to these products. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications. Product names and markings noted herein may be trademarks of their respective owners. Document Number: Revision: 18-Jul-08 1

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